/*
 * Copyright (C) 2022 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.tools.idea.insights

import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.flow

fun <T, R> Flow<T>.fold(initial: R, operation: suspend (accumulator: R, value: T) -> R): Flow<R> =
  flow {
    var accumulator: R = initial
    collect { value ->
      accumulator = operation(accumulator, value)
      emit(accumulator)
    }
  }
